<html>  
  <head>
    <title>The title</title>
  </head>

  <body>
    <h1>The heading</h1>
    <div>
      <p>
        A description
      </p>
      <button id="bio">
        Blue button
      </button>
    </div>
  </body>
  <script src="./main.js"></script>
</html>